Heating system



Patented June 1?, 1951 UNITED STATES PATENT OFFICE erick executrix ofsaid Frederick C. Broderick,

deceased Application February 21, 1948, Serial No. 10,092

8 Claims. 1

' This invention relates to new and useful improvements in heatingsystem of the type using forced hot water circulation for heating therooms or spaces and in which is incorporated a heat exchanger forheating water for domestic use over which the hot water of the system isforce circulated. In modern heating of the panel type wherein the wallsor floors of the rooms are heated, it is desirable to provide a constantrelatively low heat. To effect this condition it has been found that aconstant circulation of hot water through the heating panels isdesirable. The system herein described is particularly adaptable forsuch heating,

The primary purpose of this invention is to provide such a systemwherein, during the space heating seasons, the water is constantlycirculated in both the domestic hot water and radiator or panel circuitsbut during the summer or warm seasons the domestic circuit is pumpcirculated only when heat is required.

Another object of this invention is to provide two distinct circuitsutilizing the heated water of the boiler, one being the domestic hotwater circuit and the other being the space heating circuit, both usingforced circulation produced by a single motor.

Still another object of this invention is to provide in such a system adouble impeller pump for circulating water independently through bothcircuits.

A still further object of this invention is to provide in such a heatingsystem a simple, inexpensive arrangement of parts that will efficientlyfunction to provide even heat for rooms and adequate hot water fordomestic use.

' And still a further object is to provide such a system wherein thereturn water from the space heating circuit is mixed partially with thehot Water supply to temper the heating water directed to the radiatingmeans.

Further objects and advantages will be apparent from the followingdetailed specification.

In the drawings:

Fig. 1 is a diagrammatic view of a heating system embodying theinvention herein described.

Fig. 2 is an enlarged sectional view of the pump and pipe arrangement ofthe system shown in Fig. 1.

Fig. 3 is a cross-sectional view of fitting 28.

In detail, I is a boiler heated by burner mechanism 2 and provided witha riser 3 leading to a tank 4 within which is positioned a heat exchangecoil 5. A high limit or safety immersion type thermostat 5 and alowtemperature respon- 2 sive thermostat l of similar type are bothpositioned on the tank to be responsive to the temperature of the watertherein.

Conduit 8 leads to pump 9 which is operated by motor l0. Impeller shaftit extends from motor 10 and on its end are two impellers l2 and I3separated by a partition I 4 forming two chambers l5 and i6. Chamber l5has an inlet l1 and an outlet l8- Chamber [6 has a return inlet 19, asupply inlet 20 and an outlet 2!. Thus the pump casing has in fact threeinlets and two outlets.

Conduit 8 connects with inlet I! of pump 9 and outlet I8 is connected bymeans of pipe 22 to main boiler return conduit 23.

A supply conduit 24 leads directly from the boiler to supply inlet 20 ofchamber [6. Positioned in said conduit 24 is a motor valve 25. A pipe 26leads from the outlet 21 to return pipe 23 and radiator supply conduit21. At the point of junction a shunt fitting 28 is interposed to directa portion of the water flowing from pipe 26 to return pipe 23 and aportion to supply conduit 21.

Supply conduit 21 leads to the radiating means 29 which may be in theform of conventional radiators, panel type heat exchange units or anyradiating means. Usually a plurality of such units-are used but forconvenience only one is shown in the drawing. Radiator return conduit 30leads to return inlet l9 of the pump.

The elements above described are controlled by the immersion typethermostats 6 and I and room thermostat 3| which is usually positionedin the space to be heated. Motor valve is of the usual type adapted tobe opened when energized and closed otherwise. A two contact manualswitch 32 is provided for the purpose hereinafter described. Electricalconductors connect a source of electricity with the controls 8, l andand the heater 2, pump motor Ill and motor valve 25, as shown, so as tofunction as now described.

With the switch 32 in the position as shown in Fig. 1, immersionthermostat i will close the circuit that actuates the heater 2 and pump9 whenever the water in tank 4 falls below a predetermined temperatureand will break thecircuit when the temperature is attained. Safetythermostat 6 will break the circuit if the water reaches a determinedhigh temperature to prevent overheating in the event thermostat 1 failsto function. This is the situation during the warm seasons when spaceheating is not needed.

Switch 32 is moved to its other position at the begining of spaceheating seasons and as soon as this is done the pump 9 starts andcontinues uninterruptedly until the switch is moved to its first orsummer position. Thermostats 6 and I will control heater 2 andthermostat 3! will control motor valve 25 to open it when heat is neededadjacent the radiating means 29.

In operating during warm seasons the pump 9 will circulate water fromboiler I through tank 4 and back through pipes 8, 22 and 23 wheneverthermostat I calls for heat. The water in tank 4 will be maintained atthe desired temperature by thermostat I which controls heater 2 as wellas pump 9 with switch 32 in summer position.

During space heating or cold seasons the pump 9 will circulate watercontinuously through the domestic hot water circuit from boiler Ithrough tank 4 and return, the temperature of the water being controlledby thermostats 6 and I. Also, water will be circulated continuouslythrough the radiating or space heating circuit, its temperature beingcontrolled by thermostat 3| which will open motor valve 25 whenever moreheat is needed, to admit freshly heated boiler water from conduit 24 tothat circuit. The heated water from the boiler is mixed directly withthe return water from the radiators in chamber l6 and part of thismixture is returned to the boiler through conduit 23 and the restdirected to the radiator 29 by means of shunt fitting 28 and conduit 21.

It is clear that pump 9 is controlled by immersion thermostat 1 duringwarm seasons with switch 32 in position shown in Fig. 1 but that in coldseasons with switch 32 in its other position the pump is independent ofany control and operates continuously.

It is also clear that in the cold weather when the radiating circuit isfunctioning it will not draw hot water from the boiler to such an extentthat the water in the heat exchange coil 5 will not be heated adequatelybecause the domestic hot water circuit enjoys forced circulationwhenever the radiating circuit is in operation. Thus boiler water willbe rapidly drawn over coil 5 to assure adequate heat exchange.

Moreover, it is obvious that the constant circulation of water throughthe radiating means 29 and the periodic addition of hotter waterthereto, as called for by thermostat 3|, will provide an even constantheat for.the space to be heated.

I claim:

1. In a hot water system comprising a space heating circuit and adomestic hot water circuit, the improvement that comprises a circulatingpump having two impellers separated by a partition, one of saidimpellers connected in the domestic circuit, the other in the heatingcircuit, a hot water supply conduit connected with the .pump in theheating circuit, a motor valve interposed in said conduit, means forcontinuously operating said pump during heating seasons, means'controlling the temperature of the water in the hot water circuit andtemperature responsive means controlling the operation of the motorvalve for admitting heated water to the space heating circuit.

2. In a hot water system comprising a space heating circuit and adomestic hot water circuit ,the improvement that comprises a circulatingpump having two impellers separated by a par- I tition, one of saidimpellers connected in the domestic circuit, the other in the heatingcircuit, a hot water supply conduit connected with the pump in theheating circuit, a motor valve interposed in said conduit, means forcontinuously operating said pump during heating seasons,

4 means controlling the temperature of the water in the hot watercircuit and temperature responsive means controlling the operation ofthe motor valve for admitting heated water to the space heating circuitand a switch for stopping the continuous operation of the pump andputting it under control of the water temperature control means duringnon-space heating seasons.

3. In a hot water heating system comprising a space heating circuit anda domestic hot water circuit each independently receiving its supply ofheated water from a boiler, the improvement that comprises a circulatingpump with two impellers separated by a partition, one of said impellersconnected in the domestic circuit, the other in the space heatingcircuit, automatic valve means controlling the supply of heated water tothe space heating circuit, a thermostat controlling the valve, animmersion thermostat controlling the temperature of the water in theboiler and means for continuously operating the pump during spaceheating seasons to provide constant forced circulation in both circuits.

4. In a hot water heating system comprising a single boiler and heater,space heating circuit comprising radiating means with supply and returnpipes and a domestic hot water circuit comprising a tank and heatexchange coil in said tank, the improvement that comprises a doubleimpeller pump, a partition separating said impellers to form twochambers, one chamber being interposed in the space heating circuit, theother in the hot water circuit, a supply conduit joining the boiler withthe first chamber, automatic A valve means controlling the supply of hotwater to said first chamber and means for continuously operating thepump during heating seasons to maintain forced circulation throughoutboth circuits.

5. In a hot water heating system comprising a boiler and two independentcircuits, one for heating spaces and one for heating water, theimprovement that comprises a pump having two impellers, a partitionseparating said impellers to form two chambers, two ports in onechamber, conduits connecting said ports in the water heating circuit,three ports in the other chamber, conduits connecting two of said portsto the space heating circuit and the other to the boiler, an automaticvalve controlling said boiler connecting conduit, thermostatic meanscontrolling the Water temperature of the boiler, a motor continuouslyoperating said pump during heating season and thermostatic means in thespace to be heated controlling said valve.

6. In a heating system comprising a water heating circuit and a spaceheating circuit each receiving their hot water from the same boiler, theimprovement that comprises a double impeller pump connected in saidcircuits with each impeller adapted to separately circulate one circuit,a motor for continuously operating said pump in heating seasons, asupply conduit connecting the boiler with the space heating circuit, avalve controlling said conduit, a room thermostat controlling said valveto admit hot water to said circuit when needed, a water thermostatcontrolling the boiler water temperature and a switch positioned in saidmotor circuit for stopping its continuous operation and putting themotor under the control of the water thermostat for summer operation.

7. In a heating system comprising a water heating circuit and a spaceheating circuit each receiving their hot water from the same boiler,

5 the improvement that comprises a double impeller pump connected insaid circuits with each impeller adapted to separately circulate onecircuit, a motor for continuously-operating said pump in heatingseasons, a supply conduit connecting the boiler with the space heatingcircuit, a valve controlling said conduit, a thermostat controlling saidvalve to admit hot water to said circuit when needed and mix it with thecircuit return water and means for diverting some of such mixed waterdirectly back to the boiler.

8. In a heating system comprising a water heating circuit and a spaceheating circuit each receiving water from the same boiler, theimprovement that comprises a double impeller pump having separatechambers for each impeller, each impeller connected in one of thecircuits, a conduit leading from the boiler to one of the chambers, aradiator supply pipe leading from said chamber, a radiator return pipeleading to said chamber, a motor valve controlling the supply of hotwater from the boiler to said chamber, a room thermostat controllingsaid valve, a burner an immersion type thermostat controlling thetemperature of the boiler water by'actuating the burner when heat isneeded, a motor for the pump and a two contact switch connected in saidsystem to cause the motor to operate continuously in the space heatingseason and to put the motor under the control of the immersion typethermostat in other seasons.

FREDERICK C. BRODE'RICK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,401,193 Schetzel Dec. 27, 192129 2,081,831 Moore May 25, 1937 2,322,872 Moore June 29, 1939

